Allow abstract class expression

Fixes #728

TypeScript.YAML-tmLanguage

@@ -880,9 +880,10 @@ repository:
   class-expression:
     name: meta.class.ts
     # allows anonymous class
-    begin: '{{startOfIdentifier}}(class)\b(?=\s+|[<{]|\/[\/*])'
+    begin: '{{startOfIdentifier}}(?:(abstract)\s+)?(class)\b(?=\s+|[<{]|\/[\/*])'
     beginCaptures:
-      '1': { name: storage.type.class.ts }
+      '1': { name: storage.modifier.ts }
+      '2': { name: storage.type.class.ts }
     end: (?<=\})
     patterns:
     - include: '#class-declaration-or-expression-patterns'

TypeScript.tmLanguage

@@ -2824,10 +2824,15 @@
         <key>name</key>
         <string>meta.class.ts</string>
         <key>begin</key>
-        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(class)\b(?=\s+|[&lt;{]|\/[\/*])</string>
+        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(?:(abstract)\s+)?(class)\b(?=\s+|[&lt;{]|\/[\/*])</string>
         <key>beginCaptures</key>
         <dict>
           <key>1</key>
+          <dict>
+            <key>name</key>
+            <string>storage.modifier.ts</string>
+          </dict>
+          <key>2</key>
           <dict>
             <key>name</key>
             <string>storage.type.class.ts</string>

TypeScriptReact.tmLanguage

@@ -2828,10 +2828,15 @@
         <key>name</key>
         <string>meta.class.tsx</string>
         <key>begin</key>
-        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(class)\b(?=\s+|[&lt;{]|\/[\/*])</string>
+        <string>(?&lt;![_$[:alnum:]])(?:(?&lt;=\.\.\.)|(?&lt;!\.))(?:(abstract)\s+)?(class)\b(?=\s+|[&lt;{]|\/[\/*])</string>
         <key>beginCaptures</key>
         <dict>
           <key>1</key>
+          <dict>
+            <key>name</key>
+            <string>storage.modifier.tsx</string>
+          </dict>
+          <key>2</key>
           <dict>
             <key>name</key>
             <string>storage.type.class.tsx</string>

tests/baselines/Issue728.baseline.txt

@@ -0,0 +1,32 @@
+original file
+-----------------------------------
+export default abstract class AbstractClass {}
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>export default abstract class AbstractClass {}
+ ^^^^^^
+ source.ts meta.export.default.ts keyword.control.export.ts
+       ^
+       source.ts meta.export.default.ts
+        ^^^^^^^
+        source.ts meta.export.default.ts keyword.control.default.ts
+               ^
+               source.ts meta.export.default.ts
+                ^^^^^^^^
+                source.ts meta.export.default.ts meta.class.ts storage.modifier.ts
+                        ^
+                        source.ts meta.export.default.ts meta.class.ts
+                         ^^^^^
+                         source.ts meta.export.default.ts meta.class.ts storage.type.class.ts
+                              ^
+                              source.ts meta.export.default.ts meta.class.ts
+                               ^^^^^^^^^^^^^
+                               source.ts meta.export.default.ts meta.class.ts entity.name.type.class.ts
+                                            ^
+                                            source.ts meta.export.default.ts meta.class.ts
+                                             ^
+                                             source.ts meta.export.default.ts meta.class.ts punctuation.definition.block.ts
+                                              ^
+                                              source.ts meta.export.default.ts meta.class.ts punctuation.definition.block.ts

tests/cases/Issue728.ts

@@ -0,0 +1 @@
+export default abstract class AbstractClass {}